Hi, I am looking for some fin suggestions. I normally dive single tank in a 7mm wetsuit in cold water. I have tired the RK3 non HD and found them floppy, lack of power, heavy and buoyant (floaty feet). Wondering if I should get the Go Sport fins or Cressi Frog (not frog plus, they are too flexible) or Dive Rite XT? Looking for a pair of all round fins that is good for all fin kicks and surface swimming other than the Mares Avanti Quattro. Thanks!